CN115432966A - Pervious concrete and preparation method thereof - Google Patents
Pervious concrete and preparation method thereof Download PDFInfo
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- CN115432966A CN115432966A CN202210974240.6A CN202210974240A CN115432966A CN 115432966 A CN115432966 A CN 115432966A CN 202210974240 A CN202210974240 A CN 202210974240A CN 115432966 A CN115432966 A CN 115432966A
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000004575 stone Substances 0.000 claims abstract description 54
- 239000000203 mixture Substances 0.000 claims abstract description 31
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 24
- 238000000227 grinding Methods 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000011268 mixed slurry Substances 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims abstract description 3
- 238000000465 moulding Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000011398 Portland cement Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 7
- 238000001354 calcination Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 239000004567 concrete Substances 0.000 abstract description 27
- 230000035699 permeability Effects 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract 1
- 235000013339 cereals Nutrition 0.000 description 17
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000002956 ash Substances 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses pervious concrete and a preparation method thereof, and belongs to the technical field of concrete materials. The pervious concrete is prepared from the following raw materials in percentage by mass: 10-25% of cement, 30-50% of broken stone mixture, 10-25% of weathered material, 10-20% of modified material, 0.1-1% of water reducing agent and 1-10% of water; the preparation of the pervious concrete comprises the following steps: firstly, grinding weathered materials to 100-200 mu m; then, mixing and uniformly stirring the cement, the weathered material, the modified material and the water reducing agent according to the proportion; then, adding water and stirring uniformly; then, adding the crushed stone mixture and uniformly stirring to obtain mixed slurry; and finally, casting and molding the mixed slurry to obtain the pervious concrete. The pervious concrete provided by the invention has the advantages that the raw materials are easy to obtain, the use amount of broken stones can be reduced, and the use cost is reduced; meanwhile, the substances are matched and cooperated with each other, and the concrete has better strength and better application prospect while having certain water permeability.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to pervious concrete and a preparation method thereof.
Background
The rapid development of the economic construction of China gradually shows urban waterlogging and urban heat island effect. In this regard, the concept of "sponge city" was first proposed in 2012 and then received great attention and development; the use demand of the water-permeable concrete in urban road construction is rapidly increased; the research on novel water-permeable concrete also becomes a hot direction.
In the prior art, chinese patent 201610322853.6 discloses a highly permeable concrete based on rice hull ash, which is prepared from the following raw materials in parts by weight: 312-314 parts of cement; 26-28 parts of rice hull ash; 1394-1396 parts of aggregate I; 104-106 parts of aggregate II; 2-4 parts of a plasticizer; 111-113 parts of water; the concrete additive also comprises an auxiliary additive, and the addition volume of the auxiliary additive is 0.2-0.4% of the volume of the concrete; the used rice husk ash amount is less, and the corresponding aggregate amount is still very large. Chinese patent 201810703171.9 discloses pervious concrete with waste concrete as aggregate, a preparation method and applications thereof, wherein: crushing and screening the pretreated waste concrete to obtain coarse crushed stone and fine crushed stone; soaking the coarse crushed stone in an acid solution, fishing out and draining, and then adding sodium silicate or sodium metasilicate for surface modification; grinding and crushing the fine crushed stone, the fly ash and the coal gangue to obtain micron-sized powder; premixing portland cement, micron-sized powder, water, an additive and a reinforcing agent, adding the modified coarse crushed stone, and mixing the coarse crushed stone with pervious concrete taking waste concrete as aggregate; although waste concrete is used, the modification process is complicated. Chinese patent 201510174943.0 discloses a water permeable concrete doped with industrial waste residue and a production method thereof, wherein the components are mixed according to the mass ratio: the weight ratio of the fly ash, the silica fume, the carbide slag, the cement, the discontinuous graded aggregate, the water reducing agent = 20-30; the discontinuous graded aggregate comprises two types of crushed stones with the grain sizes of 2.5-5.0 mm and 10-15 mm, and the mass ratio of the crushed stones with the grain sizes of 2.5-5.0 mm to 10-15 mm is 1; it uses a variety of industrial wastes, but the amount is small and the water permeability is yet to be further improved.
The weathered material is a byproduct generated in the production process of magnesite, and is limited in utilization at present, for example, chinese patent 202010891304.7 and chinese patent 201410326506.1 both provide a concept of backfill protection for weathered materials, the use scenario is limited, the use amount is small, and the whole utilization value of weathered materials is not high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the pervious concrete and the preparation method thereof, wherein the broken stones, weathered materials and modified materials are used as main raw materials, so that the usage amount of the broken stones is reduced; meanwhile, the prepared concrete has good water permeability and higher mechanical strength.
In order to achieve the purpose, the invention adopts the following technical scheme:
the pervious concrete is prepared from the following raw materials in parts by mass: 10 to 25 percent of cement, 30 to 50 percent of macadam mixture, 10 to 25 percent of weathering material, 10 to 20 percent of modifying material, 0.1 to 1 percent of water reducing agent and 1 to 10 percent of water.
Preferably, the cement is 42.5 Portland cement.
Preferably, the crushed stone mixture is formed by mixing fine crushed stones with the grain diameter of 3-5 mm and coarse crushed stones with the grain diameter of 5-10mm.
Preferably, the mass ratio of the fine crushed stone to the coarse crushed stone is 1:1 to 2.
Preferably, the weathered material comprises the following components in percentage by mass: 20 to 23% CaO,21 to 25% SiO 2 ，20~24% MgO，3.5~4.5%Al 2 O 3 ，4~5.5% Fe 2 O 3 0.1 to 0.2 percent of alkali metal oxide, and the balance of loss on ignition.
Preferably, the particle size of the weathered material is 100 to 200 mu m.
Preferably, the preparation of the modified material comprises the following steps: according to the mass ratio of 1: weighing rectorite and sodium hydroxide at 0.6 to 1.2, grinding and uniformly mixing; then calcining at the temperature of 790 to 810 ℃ for 0.5 to 3 hours, and finally grinding to 50 to 80 mu m to obtain the modified material.
Preferably, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
Meanwhile, the invention also provides a preparation method of the pervious concrete, which comprises the following steps: firstly, grinding weathered materials to 100 to 200 mu m; then, mixing and uniformly stirring the cement, the weathered material, the modified material and the water reducing agent according to the proportion; then, adding water and stirring uniformly; then, adding the crushed stone mixture and stirring uniformly to obtain mixed slurry; and finally, casting and molding the mixed slurry to obtain the pervious concrete.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention provides pervious concrete, which takes a macadam mixture, a weathered material and a modified material as main formulas; the use of weathered materials and modified materials reduces the use amount of the macadam; meanwhile, the obtained pervious concrete has good water permeability and higher mechanical strength.
(2) According to the permeable concrete provided by the invention, the macadam mixture is prepared by mixing conventional coarse macadams and fine macadams, the particle sizes are respectively 5-10mm and 3-5mm, rich gaps can be formed among the macadams, and the permeable concrete is convenient to permeate water; the modification material with the particle size of 50 to 80 mu m and the weathering material with the particle size of 100 to 200 mu m are matched for use, so that the weathering material can be fully filled into gaps of the broken stones, the modification material can be fully filled into the gaps of the broken stones and the weathering material, microscopic and mutually communicated gaps in the concrete are enriched, and the water permeability of the concrete is improved; meanwhile, the internal structure of the concrete is more compact, and the mechanical strength (compressive strength) of the concrete is improved; the modified material is obtained by alkali fusion modification of a rectorite raw material, has rich microporous structures after treatment, has certain mechanical strength after high-temperature calcination, and is favorable for water flow penetration after being filled between broken stones, so that the water permeability of concrete is further improved; on the other hand, the large amount of the modified material filled between the broken stones can greatly improve the mechanical strength (compressive strength) of the concrete; in addition, the calcination of the rectorite at high temperature (790 to 810 ℃) can destroy the laminated structure of the rectorite, and the activated silica and the activated alumina which are not completely reacted can accelerate the hydration, further improve the mechanical strength of the concrete and reduce the drying shrinkage.
(3) The permeable concrete provided by the invention uses weathered materials which are byproducts in the magnesite mining process, and the utilization form of the weathered materials is single at present; the invention is based on the composition of the weathered material, and the weathered material is creatively introduced into the preparation process of the pervious concrete, so that the utilization value of the weathered material can be improved; the weathered material contains a certain amount of silicon dioxide, so that the mechanical strength (compressive strength) of the concrete can be effectively improved.
In a word, the pervious concrete provided by the invention has the advantages that the raw materials are easy to obtain, the use amount of broken stones can be reduced, and the use cost is reduced; meanwhile, the materials are matched and cooperated with each other, and the concrete has better strength and better application prospect while having certain water permeability.
Detailed Description
The following describes embodiments of the present invention in detail. It should be emphasized that the examples are illustrative and are intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the invention, the cement is 42.5-grade ordinary portland cement.
In the invention, the polycarboxylic acid high-performance water reducing agent is DH-4004.
In the invention, the weathered material comprises the following components: 22.1% CaO,22.8% SiO 2 ，20.9% MgO，4.2%Al 2 O 3 ，4.5% Fe 2 O 3 0.1 percent of alkali metal oxide, and the balance of ignition loss.
Example 1
The pervious concrete is prepared from the following raw materials in parts by mass: 18% of cement, 45% of broken stone mixture, 20% of weathered material, 15% of modified material, 0.4% of water reducing agent and 1.6% of water.
Wherein the cement is 42.5 ordinary portland cement.
Wherein the crushed stone mixture is prepared from the following components in percentage by mass of 1:1.4 fine crushed stone (the grain diameter is 3-5 mm) and coarse crushed stone (the grain diameter is 5-10mm) are mixed to obtain the composite material.
Wherein the particle size of the weathered material is 100 to 200 mu m, and the weathered material comprises the following components: 22.1% CaO,22.8% SiO 2 ，20.9% MgO，4.2%Al 2 O 3 ，4.5% Fe 2 O 3 0.1% of alkali metal oxide, and the balance of loss on ignition.
Wherein, the preparation of the modified material comprises the following steps: according to the mass ratio of 1:0.9, weighing rectorite and sodium hydroxide, grinding and uniformly mixing; then calcining the mixture at 795 ℃ for 2 hours, and finally grinding the mixture to 50 to 80 mu m to obtain the modified material.
Wherein the water reducing agent is DH-4004.
Meanwhile, the embodiment also provides a preparation method of the pervious concrete, which comprises the following steps: firstly, grinding weathered materials to 100 to 200 mu m; then, mixing and uniformly stirring the cement, the weathered material, the modified material and the water reducing agent according to the proportion; then, adding water and stirring uniformly; then, adding the crushed stone mixture and uniformly stirring to obtain mixed slurry; and finally, the pervious concrete is manufactured and molded by adopting a tamping, inserting and compacting method in a mold, so that the pervious concrete is obtained.
Example 2
The pervious concrete is prepared from the following raw materials in parts by mass: 19% of cement, 44% of broken stone mixture, 19.5% of weathered material, 15.5% of modified material, 0.3% of water reducing agent and 1.7% of water.
Wherein the cement is 42.5 ordinary portland cement.
Wherein the crushed stone mixture is prepared from the following components in percentage by mass of 1:1.5 fine crushed stone (the grain diameter is 3-5 mm) and coarse crushed stone (the grain diameter is 5-10mm) are mixed.
Wherein the grain diameter of the weathered material is 100 to 200 mu m, and the weathered material comprises the following components: 22.1% CaO,22.8% SiO 2 ，20.9% MgO，4.2%Al 2 O 3 ，4.5% Fe 2 O 3 0.1% of alkali metal oxide, and the balance of loss on ignition.
Wherein, the preparation of the modified material comprises the following steps: according to the mass ratio of 1:1 weighing rectorite and sodium hydroxide, grinding and uniformly mixing; then calcining for 1.5h at 800 ℃, and finally grinding to 50-80 mu m to obtain the modified material.
Wherein the water reducing agent is DH-4004.
Meanwhile, the embodiment also provides a preparation method of the pervious concrete, which comprises the following steps: firstly, grinding a weathered material to 100 to 200 mu m; then, mixing and uniformly stirring the cement, the weathered material, the modified material and the water reducing agent according to the proportion; then, adding water and stirring uniformly; then, adding the crushed stone mixture and uniformly stirring to obtain mixed slurry; and finally, the pervious concrete is manufactured and molded by adopting a tamping, inserting and compacting method in a mold, so that the pervious concrete is obtained.
Example 3
The pervious concrete is prepared from the following raw materials in parts by mass: 19.5% of cement, 43.5% of a gravel mixture, 18.5% of weathered materials, 16.5% of modified materials, 0.5% of a water reducing agent and 1.5% of water.
Wherein the cement is 42.5 ordinary portland cement.
Wherein the crushed stone mixture is prepared from the following components in percentage by mass of 1:1.6 fine crushed stone (the grain diameter is 3-5 mm) and coarse crushed stone (the grain diameter is 5-10mm) are mixed.
Wherein the grain diameter of the weathered material is 100 to 200 mu m, and the weathered material comprises the following components: 22.1% CaO,22.8% SiO 2 ，20.9% MgO，4.2%Al 2 O 3 ，4.5% Fe 2 O 3 0.1% of alkali metal oxide, and the balance of loss on ignition.
Wherein, the preparation of the modified material comprises the following steps: according to the mass ratio of 1:1.1 weighing rectorite and sodium hydroxide, grinding and uniformly mixing; then calcining for 1.5h at 805 ℃, and finally grinding to 50-80 μm to obtain the modified material.
Wherein the water reducing agent is DH-4004.
Meanwhile, the embodiment also provides a preparation method of the pervious concrete, which comprises the following steps: firstly, grinding weathered materials to 100 to 200 mu m; then, mixing and uniformly stirring the cement, the weathered material, the modified material and the water reducing agent according to the proportion; then, adding water and stirring uniformly; then, adding the crushed stone mixture and stirring uniformly to obtain mixed slurry; and finally, the pervious concrete is manufactured and molded by adopting a tamping, inserting and compacting method in a mold, so that the pervious concrete is obtained.
Comparative example 1
The pervious concrete is prepared from the following raw materials in parts by mass: 18% of cement, 45% of broken stone mixture, 20% of weathered material, 15% of rectorite, 0.4% of water reducing agent and 1.6% of water.
Wherein the cement is 42.5 ordinary portland cement.
Wherein the crushed stone mixture is prepared from the following components in percentage by mass of 1:1.4 of fine crushed stone (the grain diameter is 3 to 5 mm) and coarse crushed stone (the grain diameter is 5 to 10mm).
Wherein the grain diameter of the weathered material is 100 to 200 mu m, and the weathered material comprises the following components: 22.1% CaO,22.8% SiO 2 ，20.9% MgO，4.2%Al 2 O 3 ，4.5% Fe 2 O 3 0.1% of alkali metal oxide, and the balance of loss on ignition.
Wherein the particle size is 50 to 80 μm.
Wherein the water reducing agent is DH-4004.
Meanwhile, the comparative example also provides a preparation method of the pervious concrete, which comprises the following steps: firstly, grinding the weathered material to 100 to 200 mu m; then, mixing and uniformly stirring the cement, the weathered material, the rectorite and the water reducing agent according to the proportion; then, adding water and stirring uniformly; then, adding the crushed stone mixture and stirring uniformly to obtain mixed slurry; and finally, the pervious concrete is manufactured and molded by adopting a tamping, inserting and compacting method in a mold, so that the pervious concrete is obtained.
Comparative example 2
The pervious concrete is prepared from the following raw materials in parts by mass: 18% of cement, 65% of broken stone mixture, 15% of modified material, 0.4% of water reducing agent and 1.6% of water.
Wherein the cement is 42.5 ordinary portland cement.
Wherein the crushed stone mixture is prepared from the following components in percentage by mass of 1:1.4 of fine crushed stone (the grain diameter is 3 to 5 mm) and coarse crushed stone (the grain diameter is 5 to 10mm).
Wherein, the preparation of the modified material comprises the following steps: according to the mass ratio of 1:0.9, weighing rectorite and sodium hydroxide, grinding and uniformly mixing; then calcining the mixture at 795 ℃ for 2 hours, and finally grinding the mixture to 50 to 80 mu m to obtain the modified material.
Wherein the water reducing agent is DH-4004.
Meanwhile, the comparative example also provides a preparation method of the pervious concrete, which comprises the following steps: firstly, mixing cement, a modified material and a water reducing agent according to a proportion and uniformly stirring; then, adding water and stirring uniformly; then, adding the crushed stone mixture and stirring uniformly to obtain mixed slurry; and finally, the pervious concrete is manufactured and molded by adopting a tamping, inserting and compacting method in a mold, so that the pervious concrete is obtained.
The pervious concrete prepared in examples 1 to 3 and comparative examples 1 to 2 is subjected to compression strength and water permeability coefficient performance tests, and the tests are carried out according to CJJ/T135-2009. The test results are shown in table 1.
TABLE 1 pervious concrete Performance test results
As can be seen from Table 1, the concrete prepared in the examples of the present application has good water permeability and compressive strength.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The pervious concrete is characterized by being prepared from the following raw materials in parts by mass: 10 to 25 percent of cement, 30 to 50 percent of broken stone mixture, 10 to 25 percent of weathered material, 10 to 20 percent of modified material, 0.1 to 1 percent of water reducing agent and 1 to 10 percent of water.
2. The pervious concrete of claim 1, wherein said cement is 42.5 Portland cement.
3. The pervious concrete of claim 1, wherein the crushed stone mixture is a mixture of fine crushed stones with a particle size of 3-5 mm and coarse crushed stones with a particle size of 5-10 mm.
4. The pervious concrete according to claim 3, characterized in that the mass ratio of said fine and coarse crushed stones is 1:1 to 2.
5. The pervious concrete according to claim 1, characterized in that the weathered material comprises, in mass fraction: 20-23% of CaO, 21-25% of SiO 2 ，20～24％MgO，3.5～4.5％Al 2 O 3 ，4～5.5％Fe 2 O 3 0.1-0.2% of alkali metal oxide, and the balance of ignition loss.
6. The pervious concrete of claim 5, characterized in that the particle size of the weathered material is 100-200 μm.
7. The pervious concrete of claim 1, characterized in that the preparation of the modifying material comprises the following steps: according to the mass ratio of 1: weighing rectorite and sodium hydroxide 0.6-1.2, grinding and mixing uniformly; then calcining for 0.5-3 h at the temperature of 790-810 ℃, and finally grinding to 50-80 mu m to obtain the modified material.
8. The pervious concrete of claim 1, characterized in that said water-reducing agent is a polycarboxylic acid-based high performance water-reducing agent.
9. A method for preparing the pervious concrete of any one of claims 1 to 8, comprising the steps of: firstly, grinding weathered materials to 100-200 mu m; then, mixing and uniformly stirring the cement, the weathered material, the modified material and the water reducing agent according to the proportion; then, adding water and stirring uniformly; then, adding the crushed stone mixture and uniformly stirring to obtain mixed slurry; and finally, casting and molding the mixed slurry to obtain the pervious concrete.
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